DACROMET BOLTS

2026-11-07

1. Nhanganyaya

Muinjiniya yemazuva ano, majoini akasungwa anofanirwa kurwisa zvese zvemichina mitoro uye kukanganisa kwezvakatipoteredza. Traditional electro-galvanizing uye inopisa-dip galvanizing inopa anti-ngura dziviriro asi inotambura kubva kune hydrogen embrittlement mumabhaudhi akasimba-akasimba uye kukanganiswa kwedimensional pane tambo dzechokwadi. Dacromet coating, zinc-aluminium flake system yakagadzirwa muma1970s, inokunda izvi zvisingakwanisi. Iyo inoburitsa yakasarudzika corrosion kuramba, inobvisa hydrogen embrittlement njodzi, inochengetedza shinda, uye inopa yakanyanya-tembiricha kugadzikana kusvika 300 ° C. Dacromet bolts ikozvino yakatsanangurwa zvakanyanya mumotokari, kuvaka, simba remhepo, njanji, uye maindasitiri emugungwa.

2. Chii chinonzi Dacromet Coating?

Dacromet isiri-electrolytic, mvura-based zinc-flake coating inosanganisira micron-scale zinc uye aluminium flakes mune inorganic binder. Mushure mekushandisa uye kurapa, maflakes anopindirana anoumba dense multi-layer chipingamupinyi chinopa zvese zvipingamupinyi kudzivirira uye chibayiro chekudzivirira cathodic kune substrate yesimbi.

Hunhu hwakakosha:

Ukobvu hwefirimu: kazhinji 5-12 μm (yakatetepa kupfuura kupisa-dip galvanizing)
Kuonekwa: yunifomu sirivha-grey metallic kupera
Hapana hydrogen embrittlement ngozi (hapana asidi pickling kana electrolysis)
Corrosion resistance: kazhinji >1,000 maawa munyu pfapfaidzo kusvika kumarara tsvuku (ASTM B117)
High-tembiricha kuramba kusvika 300 °C inoenderera sevhisi

Iyo yekupfekedza inoiswa ne dip-spin (yakajairwa kune akawanda fasteners), pfapfaidzo, kana dip-drain, yobva yarapwa ne thermally pa ~ 300 °C. Optional topcoats anowedzera kuwedzera corrosion resistance uye kudzora coefficient of friction kuitira kuenderana torque-tension performance.

3. Coating Process Overview

Iyo yakajairika maitiro emabhaudhi ine matanho mana makuru:

1.Kugadzirira Kwepamusoro: Alkaline degreasing inoteverwa nekuchenesa michina kana zvichidikanwa. Acid pickling inodziviswa kudzivirira kutorwa kwehydrogen.

2.Coating Application: Zvikamu zvakanyikwa mu aqueous zinc-aluminium flake slurry (dip-spin for small bolts) kana sprayed; yakawandisa inobviswa ne centrifugation yeunifomu ukobvu.

3.Curing: Kubika pa 300-320 °C kunoshandura binder uye nekubatanidza maflakes esimbi kuita bhanhire rakasungwa zvakasimba.

4. Optional Topcoat / Sealer: Iyo yakatetepa sealer inovandudza lubricity, makemikari kuramba, uye inowedzera kuwedzera munyu-spray kuita.

Nemhaka yokuti maitiro acho haasi emagetsi uye haana asidi pickling, mabhaudhi ane simba guru (Giredhi 8.8, 10.9, 12.9 uye ASTM A490) anogona kuvharwa pasina njodzi yemukati yehydrogen embrittlement-yakakosha kuchengetedza mukana pane yechinyakare electroplating.

4. Mabhenefiti Akakosha eDacromet Bolts

4.1 Superior Corrosion & Anti-Rust Performance

Firimu rakaonda reDacromet (6–10 μm) rinogara richishingirira maawa 1,000–2,000 ekuyedzwa kwemunyu wekupfapfaidza munyu kusati kwaonekwa ngura tsvuku—ka7–10 zviri nani pane zvakajairika electro-galvanizing. Iyo yakawanda-layer flake chimiro inopa chipingamupinyi chekudzivirira nepo zinc flakes inopa chibayiro cathodic dziviriro. Chromate passivation inowedzera kunonoka kukora uye inopa kushomeka kuzvirapa padiki diki.

4.2 Hapana Hydrogen Embrittlement

Mabhaudhi ane simba akanyanya kubatwa nehydrogen embrittlement kubva kune acid pickling uye electroplating, izvo zvinogona kukonzera kunonoka brittle kutyoka. Dacromet inobvisa njodzi iyi zvachose. Saka inosarurwa kune yakakosha-yakakwirira-tensile fasteners mumainjini emotokari, chassis, simbi yezvimiro, uye magungano ane chekuita nekuchengetedza.

4.3 Dimensional Kururama & Thread Fit

Iine ukobvu hwekuputira chete 5-12 μm, Dacromet haichinji zvakanyanya shinda geometry. Nzungu dzakajairika dzinogona kushandiswa pasina kunyanya-tapping. Kusiyana neizvi, kupisa-dip galvanizing (40-80 μm) kunowanzoda nzungu dzakakosha. Iyi yakaonda conformal coating yakanakira mabhaudhi chaiwo uye akatsetseka-pitch fasteners.

4.4 High-Temperature Resistance & Controlled Froction

Dacromet inoramba yakagadzikana kusvika ku300 ° C inoenderera mberi sevhisi, kure nepamusoro pemiganhu ye electroplating (~ 120 ° C) kana inopisa-dip galvanizing (~ 200 ° C). Nematopcoat akakodzera iyo coefficient yekukwesha inogona kudzorwa (kazhinji μ = 0.10-0.18), kuve nechokwadi chakaenderana chisungiro mutoro uye yakavimbika yakawanda-kusimbisa maitiro.

5. Kuenzanisa Kwekuita

Tafura iri pazasi inopfupikisa misiyano yakakosha pakati peDacromet uye yakajairwa echinyakare yekurapa pamusoro pemabhaudhi:

Performance Metric	Dacromet	Electro-Galvanizing	Hot-Dip Galvanizing
Typical Ukobvu	5–12 μm	5–15 μm	40–80+ μm
Munyu Spray (kusvika kune tsvuku tsvuku)	1,000–2,000+ h	100–300 h	500–1,000 h
H₂ Embrittlement Ngozi	Hapana	Yakakwirira (inoda kubika)	Pakati
Max Continuous Temp.	≈ 300 °C	≈ 100–120 °C	≈ 200 °C
Kupindira kwe Thread	Zvidiki / Hapana	Low	Chinokosha
Mabhaudhi Akakwirira-Simba	Zvakanakisa (8.8–12.9)	Zvishoma / Nengozi	Limited
Chitarisiko	Uniform silver-grey	Bright kana blue zinc	Yakakasharara, grey

Tafura 1: Kuenzanisa mashandiro ezvakajairwa bolt pamusoro pekurapa

Dacromet inopa musanganiswa wakatanhamara wefirimu rakatetepa, yakanyanyisa corrosion kuramba, zero hydrogen embrittlement njodzi, uye yakakwirira-yekushisa-ichiita kuti ive inofarirwa kune akawanda anoda fastener application.

6. Typical Applications

Dacromet-yakavharwa mabhaudhi anoshandiswa zvakanyanya uko kuchengetedzwa kwecorrosion, chengetedzo, uye dimensional chaiyo yakakosha:

Motokari & Zvekufambisa: Injini, chassis, kumiswa uye zvisungo zvemuviri (kunyanya Giredhi 10.9 / 12.9).
Mhepo Simba & Simba: Shongwe, nacelle uye nheyo mabhoti mumahombekombe egungwa kana maindasitiri mamiriro.
Railway & Infrastructure: Tevera mafasteners, mabhiriji uye zvimiro zvekubatanidza zvinoda hupenyu hurefu hwesevhisi.
Kuvaka & Simbi Zvimiro: Mabhaudhi ane simba repamusoro-soro apo galvanizing isingadiwi.
Marine & Offshore: Zvikamu zvakafumurwa kupfapfaidza munyu uye humidity yakakwira (kazhinji ine topcoat yakagadziridzwa).
Zvekurima & Zvinorema: Michina inoshanda muvhu rinoora kana nzvimbo dzekunze.

7. Mitemo Yakakodzera & Mirayiridzo Yekusarudza

Dacromet uye yakafanana zinc-flake coatings akafukidzwa nezviyero zvepasi rose zvinosanganisira ISO 10683 (Fasteners - non-electrolytically applied zinc flake coatings), EN 13858, ASTM F1136/F1136M, uye nzira dzekupfap

Kana uchitsanangura Dacromet mabhaudhi, mainjiniya anofanirwa kufunga nezve:

Simba Grade: Yakanakira 8.8 uye kumusoro; kazhinji inosungirwa kune 10.9 / 12.9 kuchengetedza-yakakosha zvikamu.
Corrosion Kirasi: Sarudza uremu hwekuputira, nhamba yejasi uye topcoat zvinoenderana neinodiwa munyu-spray kana cyclic bvunzo kuita.
Friction Coefficient: Rondedzera yakadzorwa-lubricity topcoat kana inopindirana clamp load yakakosha.
Environment: Yakanakira maindasitiri, mota uye akawanda ekunze nharaunda; ongorora makobvu masisitimu ekunyanya kuratidzwa mugungwa.
Mutengo vs. Hupenyu-Kutenderera: Mutengo wepamusoro weyuniti pane yekutanga zinc plating inowanzogadziriswa nehupenyu hurefu hwesevhisi uye kuderera kwekugadzirisa.

8. Mhedziso

Dacromet bolts inomiririra yakakura, yakakwira-inoshanda mhinduro yekudzivirira ngura yezvitsigiro. Iyo yakatetepa zinc-aluminum flake coating inopa munyu-spray kuramba yakakwira zvakanyanya kune yakajairwa electro-galvanizing, inobvisa njodzi yehydrogen embrittlement iyo inotyisidzira mabhaudhi akasimba, inochengetedza shinda chaiyo, uye inoshingirira tembiricha yakakwira kusvika 300 ° C.

Kune mainjiniya nevatengi vari kutsvaga yakavimbika anti-ngura uye anti-corrosion kuita mumotokari, zvimiro, simba uye maindasitiri mashandisirwo, Dacromet-yakavharwa mabhaudhi inopa yakaratidza chiyero chekusimba, chengetedzo uye kuperera. Kana yatsanangurwa nemazvo-kufananidza giredhi rejasi, topcoat uye friction zvivakwa kune nharaunda yesevhisi-izvo zvinopa hupenyu hurefu hwechikamu, kuderedzwa kuchengetedza uye kuvandudzwa kwese kuvimbika system. Sekuda kwesimba repamusoro-soro, zvisungo zvenguva refu zvinoramba zvichikura, zinc-flake coatings seDacromet inoramba iri dombo repakona remazuva ano fastener surface engineering.

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